Unimicron Announces Adjustment of Cash Dividend Payout Rate

Announcement Date: June 19, 2026 Statement Date: June 18, 2026 Statement Time: 14:59:21 Company Code: 3037 Company Name: Unimicron Subject: Announcement of Adjustment to Cash Dividend Payout Rate Applicable Clause: Clause 14 Factual Date: June 18, 2026

Details: 1. Date of Board or Shareholders' Meeting Resolution: June 18, 2026 2. Original Dividend Type and Amount: Cash dividend of NT$3,151,062,394 for common shares, with NT$2.0 per share distributed. 3. Revised Dividend Type and Amount: Cash dividend of NT$3,151,062,394 for common shares, with NT$1.98015311 per share distributed. 4. Reason for Change: Due to the conversion of the company's convertible bonds into common shares, resulting in a change in the number of outstanding shares, the Chairman was authorized by the Board on June 8, 2026 to adjust the cash dividend payout rate. 5. Other Matters to be Disclosed: None.